Scheda di esercizi di Chimica per i test di ammissione a infermieristica con soluzioni

What is a dilute solution?

1. AOne with a small amount of solute in a lot of solvent
2. BOne with a large amount of solute in a little solvent
3. COne in which the solute has reacted with the solvent
4. DOne with no solvent at all

Che cosa indica il numero atomico di un elemento?

1. AIl numero di neutroni in ogni atomo
2. BIl numero di protoni in ogni atomo
3. CIl numero totale di protoni e neutroni nel nucleo
4. DIl numero di atomi in una mole dell'elemento

What are the building blocks (monomers) of proteins?

1. ANucleotides
2. BFatty acids
3. CSimple sugars
4. DAmino acids

What is carbon-14 dating used for?

1. AEstimating the age of material that was once alive
2. BMeasuring body temperature
3. CDetecting carbon monoxide in a room
4. DFinding the exact age of rocks that are billions of years old

How does ionisation energy (the energy needed to remove an outer electron) generally change from left to right across a period?

1. AIt increases
2. BIt stays the same
3. CIt first falls, then rises sharply
4. DIt decreases

In the reaction Zn + Cu²⁺ → Zn²⁺ + Cu, which species loses electrons?

1. AZn
2. BCu²⁺
3. CCu
4. DZn²⁺

For N₂ + 3H₂ → 2NH₃, 1 mol of N₂ is mixed with 2 mol of H₂. Which reactant is limiting?

1. AH₂, because 1 mol of N₂ would need 3 mol of H₂
2. BNeither, because both are used up exactly
3. CNH₃, because it is the product
4. DN₂, because there is less of it

Ammonia (NH₃) has three bonding pairs and one lone pair on nitrogen. What is its shape?

1. ATetrahedral
2. BFlat triangle (trigonal planar)
3. CLinear
4. DTrigonal pyramidal